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It reduces it.

This is because when reactions occur the atoms 'bump into' each other. The less atoms per space (decreased concentration) the less bumping in a given period takes place, therefore creating a slower reaction. 

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Q: How does decreasing reactant concentration affect the rate of reaction?
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How will decreasing reactant concentration affect the reaction rate?

Decreasing the reactant concentration will slow the rate of the reaction. If you use the idea of adding oxygen and hydrogen to make water and decease the amount of one, you will produce less water. It doesn't matter which reactant is less as there are just are not enough to go around.


How will decreasing the reactant concentration affect the rate of reaction?

Decreasing the reactant concentration will slow the rate of the reaction. If you use the idea of adding oxygen and hydrogen to make water and decease the amount of one, you will produce less water. It doesn't matter which reactant is less as there are just are not enough to go around.


How does an increase in reactant concentration affect the rate of reaction?

It leads to more frequent collisions, which increase reaction rate.


How will decreasing the reactant concentration affect the reaction?

It depends on the order of the reaction. If it is zero order, decreasing the reactant concentration will have NO effect on the rate. If it is 1st or 2nd order (or more), then decreasing the concentration will DECREASE the reaction rate.


If the order of a chemical reaction with respect to one of its reactants is zero how does that reactant's concentration affect the rate of the chemical reaction?

It doesn't - the reaction rate will not change regardless of how much of that reactant is added. That's the definition of zero-order.


Does the amount of reactant affect the amounts of product?

The more reactant, the faster the reaction The less reactant, the slower the reaction hope that clears it up for you


How does concentraition affect the rate of a chemical reaction?

Usually, increasing concentration of reactants increases the rate of reaction, but increasing concentrations of products reduces the rate of reaction. However, if one reactant is already present in large stoichiometric excess over another, increasing the concentration of that reactant may not increase the rate of reaction at all, and if the free energy of reaction is large enough in magnitude, increasing the concentration of products may not reduce the rate of reaction at all.


Does the mass of a solid reactant affect the reaction rate?

yes it does


How factors affect rates of physical change?

-Reactant Concentration • The greater the concentration of reactants (the more particles per unit volume), the greater will be the number of effective collisions per unit time, and therefore, the reaction rate will generally increase. • For zero order reactions, however, the reaction rate is not dependent on the concentration of reactants. Increasing the reactant concentration will have no effect on the rate. -Temperature • The reaction rate will increase as the temperature of the system increases. As the temperature increases, the reactant molecules have more energy. They thus find it easier to climb the energy barrier to the reaction (the activation energy). -Solvent • The reaction rate will increase as the temperature of the system increases. As the temperature increases, the reactant molecules have more energy. They thus find it easier to climb the energy barrier to the reaction (the activation energy).


How can affect of heat on a reaction be determined?

heat is treated as a reactant or a product


A factor that affects the rate of reaction?

There are several factors that affect the rate of reaction: -The surface area available. -Temperature -Availability of catalyst. -Concentration, if a/the reactant(s) is/are solutions. -Pressure, if a/the reactants(s) is/are gases. -Reactivity of reactants. -Activation energy of the reaction.


How does the concentration of reactant affect the rate of a reaction?

Increasing the concentration increases the molecules' collision frequency.